Micro arugula leaves curl up

Micro arugula leaves curl up

Mon Apr 16, 2018 9:31 am

Some of My micro arugula leaves are curling upwards. I have a rack with trays of 18 x 26" per layer. One rack has 22 watts per layer. Another rack has 12 watts per layer. They both have the same problem.Can anyone help me out as to what the problem is?